// 1、number
let age: number = 29;

// 2、string
let uname: string = '阿程';

// 3、boolean
let jiehun: boolean = true;
let jie: string = jiehun ? '已经结婚' : '没有结婚';

// 4、undefined
let u: undefined = undefined;

// 5、null
let n: null = null;

console.log(`我叫${uname}，今年${age}岁了，${jie}`);
